package com.wyu.blog.component;

import org.springframework.lang.Nullable;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 使用拦截器处理登录检查
 * Created by hgq on 2019/11/26.
 */
public class AdminHandlerInterceptor implements HandlerInterceptor{


    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
                             Object handler) throws Exception {

        Object admin = request.getSession().getAttribute("admin");
        if(admin == null){
            //未登录,返回登录页面
            request.setAttribute("msg","没有权限请先登录");
            request.getRequestDispatcher("/admin").forward(request,response);
            return false;
        }else{
            //已登录,放行请求
            return true;
        }
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response,
                           Object handler, @Nullable ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response,
                                Object handler, @Nullable Exception ex) throws Exception {

    }
}
